Sawmill-dog



(N0 Model.)

G. P. KNIGHT.

SAWMILL DOG.

No. 483,224. Patented Sept. 27, 1892.

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UNITED STATES PATENT OFFICE.

GEORGE F. KNIGHT, OF CANTON, OHIO.

SAWMILL-DOG.

SPECIFICATION forming part of Letters Patent No. 483,224, dated September 27,1892.

Application filed February 27, 1892. Serial N0. 1 modem To aZZ whom it may concern.-

Be it known that I, GEORGE F. KNIGHT, a citizen of the United States, and a resident of Canton, county of Stark, State of Ohio, have inventeda new and useful Improvement in Sawmill-Dogs, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, making part of this specification.

My invention relates to an improvement in sawmill-dogs; and it consists in providing an effective, durable, and more convenient means of locking the dog-supporting bar.

With these ends in view my invention conslsts of certain features of construction and combination of parts, as will be hereinafter described; and pointed out in the claims.

Figure 1 is a view in perspective of a sawmill-dog, illustrating my invention; Fig. 2, a Vertical sectional view; Fig. 3, a front and side elevation of the standard.

Similar letters of reference indicate corresponding parts in all of the figures of the drawings.

A represents a log-carriage, B the headblock, and O a knee portion adjustable on the head-block transverse the carriage, to which is secured a vertical supporting-bar D. The end portions of said bar are turned at a right angle with the body and provided with elongated apertures transverse the bar, in which is placed a vertically-sliding bar E, on which is provided a sliding dog-supporting head F, having a vertical aperture a, ahorizontal offset aperture 1), a recess 0, and an outwardlyprojected hub d. The bar E is placed in the aperture a, the dog G in aperture b, and in the recess a a hardened-steel plate 6, and in the hub d a threaded aperture.

To secure the head F and dog G in desired adjustment on the bar E, a cranked lever H is provided, the pin or axle portion 9 having an annular thread adapted to the thread in the hub d of the head F, said axle portion having an axle or longitudinal aperture h, threaded at its outer end portion to receive a set-screwy and the inner end to receive and in close a hardened-steel pin 76, one end of which rests against the plate c, the other against the end of the set-screw J. A jam-nut Z is placed on the set-screw to be turned against the end of the hub cl, by which the screw is secured against rotation after the parts eifected by the movement of the screw have been ad.- justed for operation; or, if preferred, the screw J may be extended to engage the back of the plate e. The object sought by the parts, the screw and the pin, is to provide means for lengthening or maintaining the length of the axle-pin.

As the lever l-I serves as a handle by which the operator may raise or lower the head F, as well as a lever to lock the parts in desired adj ustment, it is desirable that its position be one convenient to the operator and that its rotary movement or throw about the axle portion be limited, and to provide for wear the set-screw j may be turned in to move the pin it in against the plate 6, thus providing means for maintaining a desired length of the axlepin portion g of the lever H by means of the movable pin and screwj.

As heretofore made the previously-determined or fixed end on of the axle portion 9 of the lever H engaged the plate 6, the constant grinding movement of the end of the axle-pin in locking and unlocking the parts would wear away the parts in contact and allow the lever to fall below the center or to the side opposite that shown in Fig. 1, at which pointthe lever could not be used as a handle to raise or lower the head.

The actuating-lever L is of the form shown, having a handle portion a, a heel 0, and toe 19. At the lower portion of the bar E is provided a pin q, to which the heel of the lever is pivotally secured, and at the toe of the lever is an outwardly-projected pin 0*, that enters the loop 3 provided therefor at the lower end of the bar D, thus forming a fulcrum about which the lever turns to raise'or lower the bar E. t

It will be understood that the dog G is adjustable longitudinally in the head to carry the bit to or from the head, and that the dog and head F are locked or clamped to the sliding bar E by the lever H.

Having thus described the nature and the object of my invention, whatI claim as new, and desire to secure by Letters Patent, is-- 1. The combination, with the vertical supporting-bar D, of the vertically-slidable bar E, the head F, having an aperture a, an otfset aperture 1), a recess 0, threaded huh d,

plate e, and a locking mechanism comprising a leverH,"liaving an apertured axle portion to turn into the hub 61, and a through pin or screw whereby the length of said axle may be maintained or increased, substantially as described, and for the purpose set forth.

2. The combination, with thevertical slidable bar E, of the adjustable head F and dog G,a crank-lever H, having an apertured spin- (116 to turn into said head, having adjustable therein means whereby the length of said axle may be maintained against wear or the length increased, as the case may be, substantially as described, and for 'the purpose set forth.

3. The combination, with the supporting ikneeO, of the bar D, having its endturned and my hand this 20th day of February, A. D. 1892.

GEORGE F. KNIGHT. Witnesses:

W. K. MILLER, OHAs. R. MILLER. 

